I had checked all 3 boxes (Complete last step, trans from pose at start, trans from pose at end) but the character never completes the last step.

Now, one thing I tried was going into the base layer and adding 15 extra keyframes (making it 95) and shortening the blend frames to 5, then returning to the walkpath and restricting it to 80 frames. It worked the first time, but my PC glitched and I had to reload it. I followed the exact same steps and it didn't work again. In another instance, MOST of the body returned to the standing pose, but one of the legs was left still up in the air from the last running pose. I don't understand what is going on with it...